How can PHP be used to detect the file extension of a file with no extension?

When a file has no extension, it can be challenging to determine its file type. One way to detect the file extension of a file with no extension is by using PHP's `finfo` function, which can analyze the file's contents and provide information about its type. By utilizing this function, we can determine the file extension even if it is not explicitly stated in the file name. 

// Open the file
$file = 'file_with_no_extension';
$finfo = finfo_open(FILEINFO_MIME_TYPE);

// Get the MIME type of the file
$mime_type = finfo_file($finfo, $file);

// Get the file extension from the MIME type
$extension = explode('/', $mime_type)[1];

// Output the file extension
echo "File extension: $extension";

// Close the file
finfo_close($finfo);

Keywords

PHP file extension detection pathinfo mime_content_type

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